Air-cooled cylinder



0a. 2-1. 192%. 1,512,295 H. B.- MASSEY I AIR 000L155 CYLINDER Filed Dec.21. 1921 2 Sheets-Sheet l Patented Get. 21 1924.

barren stares Emmet HEMSLEY B. Massey, or CANTON, OHIO.

Am-oooLEn. oynmnna.

To-all whom it may concern:

-' Be it known that 1, HEMSLEY B; MASSEY, a citizen of the UnitedStates, residing at Canton, in the county of Stark and State of Ohio,have invented anew and useful Air-Cooled Cylinder, of which thefollowing is a specification. t

The invention relates to air cooled cylinders for internal combustionengines which are provided with radial cooling fins surrounded byajacket forming-longitudinal flues, through which air is drawn orvforced thus described may be fused or welded-upon for the purpose ofcooling the, cylinder.

Cooling fins cannot be cast sufficiently thin and close enough togetherto produce a maximum cooling efliciency; and it has been customary tomake the sameof thin strips of sheet metal but' again in practice suchfins cannot be used thin enough nor can they be placed close enoughtogether to obtain the maximum cooling efliciency.

Thex present invention involves the use of a continuous sheet of metalcrimped and" closed together to form alternately reversed triangulartubes; the outer bases of the triangles comprising a continuous jacketand the inner bases of the triangles being preferabl rounded and castorwelded to the eri cry of the cylinder. I

Tl ie iiivention may be embodied in the mannerillustrated in theaccompanying drawings, forming part hereof, in which-- :Figure 1 is atransverse section'of theim proved cylinder;

Fig. 2, a longltudinal section of the same .on line HH, Fig. 1;

Fig. 3, a longitudinal section of the crimped sheet on a mandrel patternresting on a core print and bottom board:

Fig. 4, a similar view, showing the drag section of a flask in positionand filled with san Fig. 5, a similar section of the drag sectioninverted and the core print and mandrel I pattern removed; and. Fig. 6,a section through the cope and dragsection of a flask, showing sandcores in esition and a cylinder cast in the flask. imilar numerals referto similar parts throughout the drawings. V

The improved cylinder may be made by crimping a sheet of metal toformaseries or reversely positionedtriangles, with the sides or theirbases in abutment, thus form- 'position as shown in Fig. 6.

Application filed December 21, 1921. Serial No. 523,929.

ing reversely positioned triangular tubes as shown in Fig. 2; the endsofthe sheet being welded together to form a continuous sheet.

The bases 7 of the outer triangular tubes 8 together form a continuousjacket integral with the common walls of the adjacent tubes, and thebases 10,013 the inner tubes 11 are preferably rounded to form angularorpointed ovids, the rounded bases of which are fused or welded integralwith the ps riphery ofthe wall 12 of the cylinder.

The continuous sheet metal fins and jacket the peripheryof. a cylinderby placing the same in a mold around a mandrel pattern 13, and retainingthe same in proper diam- 'eter' by means of hoops or rings 14, thecrimped sheet being "temporarily supported aflask may be placed upon thebottom board around the mandrel pattern and then filled with sand asshown in Fig. 4. I a

The drag may then be inverted and the mandrel pattern and core printremoved to complete the mold, as shown in Fig. 5. Sand cores 17 and 18are then inserted in the mold, and a cope section 18f filled with sandand provided with a gate 19 is then placed in By pouring metal throughthe gate, a

cylinder 20 iscast aroilnd the core and within the surrounding bases ofthe triangular tubes 11 which are therebyfused 0r welded integral withthe metal of the cylinder, the

sheet'metal being preferably coated with tin if desired to. facilitate.the operation, in a well known manner.

By thus forming the fins of a continuous sheet, crimped into triangular.tubes, much.

thinner metal can be used which can be readily handled in the foundryprocesses. There is only one continuous part to place in the mold andall the tubes naturally find their proper position when mounted around amandrel pattern and sustained thereon by surrounding hoops or rings. Anequa or greater cooling area is obtained by the use of thinner metal ascompared w1th separate strip fins, and the use of a separate jacket isobviated by the jacket formed by the integral bases of the outertriangular tubes, which being integral, increases the area of theradiating surface.

I claim? 1. The method of making engine cylinders comprising shaping a.sheet'of metal to provide cooling fins and an annular jacket integralwith the same, placing the same in a mold, and casting a cylinder withinthe same.

2. The method of making engine cylinders comprising shaping a sheet ofmetal to provide cooling fins-and an annular jacket integral with thesame, coating the sheet With tin, placing the; same in a mold, andcasting a cylinder Within the same.

3. The method of making engine cylinders comprising shaping a sheet ofmetal to form comprising shaping a continuous sheet of metal to form acontinuous plurality of oppositely tapered tubular portions and fusingthesame to a cylinder.

HEMSLEY B. MASSEY.

